So Microsoft says 'No Windows Phone 7 Series for you', for the stupidest reason known to man:
The phones have the wrong buttons.

Are you crazy? What kind of reason is that?
So the question is, can the folks at XDA developers get it on the HD2? A main problem I could think of is whether or not HTC/LG releases ROM updaters for the phones. If they don't, where will we get ROMs?